Winthrop, WA Weather & Growing Conditions
This Afternoon
58°F
Mostly Sunny
Mostly sunny, with a high near 58. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Mostly Sunny | 7 mph S | 1% |
| Tonight | 44°F | Mostly Clear | 2 to 6 mph S | 1% |
| Sunday | 59°F | Sunny | 2 to 7 mph S | 0% |
| Sunday Night | 45°F | Mostly Clear | 6 mph SW | 0% |
| Monday | 57°F | Mostly Sunny | 3 to 9 mph W | 0% |
| Monday Night | 41°F | Partly Cloudy | 6 to 9 mph NW | 0% |
| Tuesday | 52°F | Mostly Sunny | 6 to 9 mph W | 0% |
| Tuesday Night | 35°F | Mostly Cloudy | 9 mph W | 1% |
| Wednesday | 46°F | Mostly Sunny | 7 to 10 mph W | 5% |
| Wednesday Night | 34°F | Mostly Cloudy | 6 to 10 mph W | 9% |
| Thursday | 43°F | Partly Sunny then Slight Chance Rain Showers | 7 mph E | 17% |
| Thursday Night | 35°F | Chance Rain Showers then Slight Chance Rain And Snow Showers | 7 mph NE | 26% |
| Friday | 41°F | Slight Chance Rain And Snow Showers | 6 to 9 mph N | 20% |
| Friday Night | 32°F | Slight Chance Rain Showers then Slight Chance Rain And Snow Showers | 9 mph NW | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winthrop, WA
Last spring frost
May 9
First fall frost
Sep 29
Growing season
142 days
Hardiness zone
6a
Explore more for Winthrop, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Mazama, Wa (12.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.